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Support optimization of the ring primary mirror of a 2-m solar telescope
Yang, Dehua1; Jin ZY(金振宇)2; Liu Z(刘忠)2; Yang, Dehua, Nanjing Univ Aeronaut & Astronaut, Coll Automat Engn, 29 Jiangjun Ave, Nanjing 211106, Jiangsu, Peoples R China.
会议录名称Proceedings of SPIE - The International Society for Optical Engineering - Ground-Based and Airborne Telescopes VI
2016
卷号9906
DOI10.1117/12.2232507
产权排序第2完成单位
收录类别EI ; CPCI
会议名称Conference on Ground-Based and Airborne Telescopes VI
会议日期2016-06-26
会议地点Edinburgh, SCOTLAND, United kingdom
关键词Solar Telescope Ring Primary Mirror Support Optimization Sensitivity Estimation
摘要A special 2-m Ring Solar Telescope (2-m RST) is to be built by YNAO-Yunnan Astronomical Observatory, Kunming, China. Its distinct primary mirror is distinctively shaped in a ring with an outer diameter of 2.02 m and a ring width of 0.35 m. Careful calculation and optimization of the mirror support pattern have been carried out first of all to define optimum blank parameters in view of performance balance of support design, fabrication and cost. This paper is to review the special consideration and optimization of the support design for the unique ring mirror. Schott zerodur is the prevailing candidate for the primary mirror blank. Diverse support patterns with various blank thicknesses have been discussed by extensive calculation of axial support pattern of the mirror. We reached an optimum design of 36 axial supports for a blank thickness of 0.15 m with surface error of 5 nm RMS. Afterwards, lateral support scheme was figured out for the mirror with settled parameters. A classical push-And-pull scheme was used. Seeing the relative flexibility of the ring mirror, special consideration was taken to unusually set the acting direction of the support forces not in the mirror gravity plane, but along the gravity of the local virtual slices of the mirror blank. Nine couples of the lateral push-pull force are considered. When pointing to horizon, the mirror surface exhibits RMS error of 5 nm with three additional small force couples used to compensate for the predominant astigmatism introduced by lateral supports. Finally, error estimation has been performed to evaluate the surface degradation with introduced errors in support force and support position, respectively, for both axial and lateral supports. Monte Carlo approach was applied using unit seeds for amplitude and position of support forces. The comprehensive optimization and calculation suggests the support systems design meet the technic requirements of the ring mirror of the 2-m RST. © 2016 SPIE.
语种英语
学科领域天文学
文章类型Proceedings Paper
出版者SPIE-INT SOC OPTICAL ENGINEERING
出版地1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
ISBN号978-1-5106-0191-8; 978-1-5106-0192-5
ISSN号0277-786X
URL查看原文
WOS记录号WOS:000387731100150
WOS研究方向Instruments & Instrumentation ; Optics
WOS类目Instruments & Instrumentation ; Optics
引用统计
文献类型会议论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9792
专题抚仙湖太阳观测站
通讯作者Yang, Dehua, Nanjing Univ Aeronaut & Astronaut, Coll Automat Engn, 29 Jiangjun Ave, Nanjing 211106, Jiangsu, Peoples R China.
作者单位1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China
2.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650216, China
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GB/T 7714
Yang, Dehua,Jin ZY,Liu Z,et al. Support optimization of the ring primary mirror of a 2-m solar telescope[C]. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA:SPIE-INT SOC OPTICAL ENGINEERING,2016.
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